Harry Potter: The Prisoner of Azkaban & The Goblet of Fire

In the Prisoner of Azkaban, it's Harry's third year at Hogwarts; not only does he have a new "Defense Against the Dark Arts" teacher, but there is also trouble brewing.

Convicted murderer Sirius Black has escaped the Wizards' Prison and is coming after Harry. In the Goblet of Fire, Harry finds himself selected as an underaged competitor in a dangerous multi-wizardary school competition.